o
    `ZhN                     @   st   d dl Z d dlmZ d dlmZ d dlmZ d dlmZ d dl	m
Z
 d dlmZ d dlmZmZ G d	d
 d
eZdS )    N)Decimal)Apps)NotSupportedError)BaseDatabaseSchemaEditor)	Statement)strip_quotes)NOT_PROVIDEDUniqueConstraintc                       s   e Zd ZdZdZdZeZdZdZdZ	dZ
dZ fddZ fd	d
Zdd Zdd Z	d#ddZd$ fdd	Z fddZ fddZ	d%ddZdd Z fddZ fdd Zd!d" Z  ZS )&DatabaseSchemaEditorzDROP TABLE %(table)sNzEREFERENCES %(to_table)s (%(to_column)s) DEFERRABLE INITIALLY DEFERREDz,ALTER TABLE %(table)s DROP COLUMN %(column)sz7CREATE UNIQUE INDEX %(name)s ON %(table)s (%(columns)s)zDROP INDEX %(name)sc                    s   | j  s	tdt  S )NzSQLite schema editor cannot be used while foreign key constraint checks are enabled. Make sure to disable them before entering a transaction.atomic() context because SQLite does not support disabling them in the middle of a multi-statement transaction.)
connectionZdisable_constraint_checkingr   super	__enter__self	__class__ X/var/www/html/lang_env/lib/python3.10/site-packages/django/db/backends/sqlite3/schema.pyr      s
   

zDatabaseSchemaEditor.__enter__c                    s(   | j   t ||| | j   d S N)r   Zcheck_constraintsr   __exit__Zenable_constraint_checking)r   exc_type	exc_value	tracebackr   r   r   r   &   s   
zDatabaseSchemaEditor.__exit__c                 C   s   zdd l }||}W n ty   Y n
 |jy   Y nw t|tr)tt|S t|tt	tfr5t|S t|trBd|
dd S |d u rHdS t|tttfrVd|  S td|t|f )Nr   z'%s''z''ZNULLzX'%s'z*Cannot quote parameter value %r of type %s)sqlite3ZadaptImportErrorZProgrammingError
isinstanceboolstrintr   floatreplacebytes	bytearray
memoryviewhex
ValueErrortype)r   valuer   r   r   r   quote_value+   s*   

z DatabaseSchemaEditor.quote_valuec                 C   s
   |  |S r   )r)   )r   r(   r   r   r   prepare_defaultJ   s   
z$DatabaseSchemaEditor.prepare_defaultc              	      s  fddfddj jD }fddj jD }i d}|p#g }t|dds3td	d
 |D r[t| D ]!\}|jrZtfdd
|D sZd|_|}|jrZ|= ||j= q9|r{|||j	< |j
tu r{|js{|js{|jr{|||j< |D ]T}	|	\}
}||
j	d ||
jd |||j	< |
jr|js|j
tu r|}n|\}}d|
j|d }|||j< n	|
j||j< |j	|
j	< q} r| j	= | jd  jr jjj jr jjS t }fddj jD }fddj jD }j j} r fdd|D }tj j}t|}j jj j |||||d}t!dd|}||d< j"|d< t!j j#j$| t|}j jdt%j j  |||||d}t!dd|}||d< j"|d< t!dj j# j$|}&| 'd|j j d(fdd
|D d(|) j j f  jdd *||j j j j  j+D ]}'| qg _+|rd|_dS dS )a|  
        Shortcut to transform a model from old_model into new_model

        This follows the correct procedure to perform non-rename or column
        addition operations based on SQLite's documentation

        https://www.sqlite.org/lang_altertable.html#caution

        The essential steps are:
          1. Create a table with the updated definition called "new__app_model"
          2. Copy the data from the existing "app_model" table to the new table
          3. Drop the "app_model" table
          4. Rename the "new__app_model" table to "app_model"
          5. Restore any index of the previous "app_model" table.
        c                    s   | j o| jj u S r   )Zis_relationremote_fieldmodel)f)r,   r   r   is_self_referentialc   s   z?DatabaseSchemaEditor._remake_table.<locals>.is_self_referentialc                    s$   i | ]}|j  |r| n|qS r   )nameclone.0r-   )r.   r   r   
<dictcomp>g   s    z6DatabaseSchemaEditor._remake_table.<locals>.<dictcomp>c                    s&   i | ]}|j d u r|j |jqS F)	generatedcolumn
quote_namer1   r   r   r   r3   m   s
    
Nprimary_keyFc                 s   s     | ]\}}t |d dV  qdS )r8   FN)getattrr2   _	new_fieldr   r   r   	<genexpr>x   s    
z5DatabaseSchemaEditor._remake_table.<locals>.<genexpr>c                 3   s    | ]
\}} |j kV  qd S r   r/   r:   r>   r   r   r=   |   s
    
zcoalesce(%(col)s, %(default)s))coldefaultc                       g | ]} fd d|D qS )c                       g | ]}  ||qS r   getr2   nrename_mappingr   r   
<listcomp>       ADatabaseSchemaEditor._remake_table.<locals>.<listcomp>.<listcomp>r   )r2   uniquerG   r   r   rI          z6DatabaseSchemaEditor._remake_table.<locals>.<listcomp>c                    rA   )c                    rB   r   rC   rE   rG   r   r   rI      rJ   rK   r   r2   indexrG   r   r   rI      rM   c                    s   g | ]
} j |jvr|qS r   )r/   fieldsrN   delete_fieldr   r   rI      s    )	app_labeldb_tableunique_togetherindex_togetherindexesconstraintsappsZMetar   
__module__znew__%szNew%s%INSERT INTO %s (%s) SELECT %s FROM %s, c                 3   s    | ]}  |V  qd S r   )r7   )r2   xr   r   r   r=      s    )handle_autom2mT),_metaZlocal_concrete_fieldsr9   anylistitemsr8   auto_createdr6   r/   
db_defaultr   many_to_manyr5   Zconcreter*   effective_defaultpopnullZdb_default_sqlr7   r+   throughdelete_modelr   rU   rV   rW   rX   copydeepcopyrS   rT   r'   rZ   Zobject_name	__bases__r   create_modelexecutejoinvaluesZalter_db_tabledeferred_sql)r   r,   create_fieldrR   alter_fieldsbodymappingZrestore_pk_fieldfieldZalter_field	old_fieldr<   r@   r;   Zcase_sqlrY   rU   rV   rW   rX   Z	body_copyZmeta_contentsmetaZ	new_modelsqlr   )rR   r.   r,   r/   rH   r   r   _remake_tableM   s   












	

	



z"DatabaseSchemaEditor._remake_tableTc                    sj   |r
t  | d S | | jd| |jji  t| jD ]}t	|t
r2||jjr2| j| qd S )Ntable)r   rj   ro   sql_delete_tabler7   r_   rT   ra   rr   r   r   Zreferences_tableremove)r   r,   r^   rz   r   r   r   rj     s   z!DatabaseSchemaEditor.delete_modelc                    s   ddl m} |jr|jjjjr| |jj dS |js3|j	s3|j
r3| |dus3|jtur<t|j|s<| j||d dS t || dS )zCreate a field on a model.r   )ValueN)rs   )Zdjango.db.models.expressionsr   re   r+   ri   r_   rc   rn   r8   rL   rh   rf   rd   r   r   r{   r   	add_field)r   r,   rw   r   r   r   r   r   $  s   	

zDatabaseSchemaEditor.add_fieldc                    s   |j r|jjjjr| |jj dS dS | jjjr1|j	s1|j
s1|js1|jr(|js1t || dS |j| jdd du r>dS | j||d dS )z
        Remove a field from a model. Usually involves deleting a column,
        but for M2Ms may involve deleting a table.
        )r   r'   NrQ   )re   r+   ri   r_   rc   rj   r   featuresZcan_alter_table_drop_columnr8   rL   Zdb_indexdb_constraintr   remove_fieldZdb_parametersr{   )r   r,   rw   r   r   r   r   @  s(   	z!DatabaseSchemaEditor.remove_fieldFc	                 C   sN  |j |j kr+| ||| ||kr+|jr|js+|jr|js+| | |jj|||S | j|||fgd |	d}	|	d}
|j
r||ksJ|	|
krt }|jj}|jD ]&}|j|kr\qT|jsl|j|jkrk||j qT|jrz|jjjrz||j qT|jr|jD ]}|j|krq|jjjjr||jj q|D ]}| | qdS dS dS )z3Perform a "physical" (non-ManyToMany) field update.rt   	collationN)r6   Z
column_sqlr+   r   ro   Z_rename_field_sqlr_   rT   r{   rD   rL   setr,   Zrelated_objectsrelated_modelre   
field_namer/   addr8   ri   rc   )r   r,   rx   r<   Zold_typenew_typeZold_db_paramsZnew_db_paramsstrictZold_collationZnew_collationZrelated_modelsoptsr+   re   r   r   r   r   _alter_field\  sX   





z!DatabaseSchemaEditor._alter_fieldc                 C   s   |j jjj|j jjjkr=| j|j j|j jj| |j jj| f|j jj| |j jj| fgd dS | |j j | 	d| 
|j jjjdd| | gdd| | g| 
|j jjjf  | |j j dS )z*Alter M2Ms to repoint their to= endpoints.r   Nr[   r\   id)r+   ri   r_   rT   r{   	get_fieldZm2m_reverse_field_nameZm2m_field_namern   ro   r7   rp   Zm2m_column_nameZm2m_reverse_namerj   )r   r,   rx   r<   r   r   r   r   _alter_many_to_many  sV   





z(DatabaseSchemaEditor._alter_many_to_manyc                    B   t |tr|js|js|js|jrt || d S | | d S r   )	r   r	   	conditioncontains_expressionsinclude
deferrabler   add_constraintr{   r   r,   
constraintr   r   r   r        
z#DatabaseSchemaEditor.add_constraintc                    r   r   )	r   r	   r   r   r   r   r   remove_constraintr{   r   r   r   r   r     r   z&DatabaseSchemaEditor.remove_constraintc                 C   s   d| S )NzCOLLATE r   )r   r   r   r   r   _collate_sql  s   z!DatabaseSchemaEditor._collate_sql)NNN)Tr4   )__name__rZ   __qualname__r}   Zsql_create_fkZsql_create_inline_fkZsql_create_column_inline_fkZsql_delete_columnZsql_create_uniqueZsql_delete_uniqueZsql_alter_table_commentZsql_alter_column_commentr   r   r)   r*   r{   rj   r   r   r   r   r   r   r   __classcell__r   r   r   r   r
      s6    
 F%
:@r
   )rk   decimalr   Zdjango.apps.registryr   Z	django.dbr   Zdjango.db.backends.base.schemar   Z!django.db.backends.ddl_referencesr   Zdjango.db.backends.utilsr   Zdjango.db.modelsr   r	   r
   r   r   r   r   <module>   s    